DOI 10.1007/s100529800996
Equilibrium and non-equilibrium hard thermal loop resummation
in the real time formalism
M.E. Carrington1 - H. Defu2 - M.H. Thoma3,4
1 Department of Physics, Brandon University, Brandon, Manitoba, R7A6A9 Canada
2 Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
3 Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany
4 European Center for Theoretical Studies in Nuclear Physics and Related
Areas, Villa Tambosi, Strada delle Tabarelle 286, I-38050 Villazzano, Italy
Received: 9 April 1998 / Published online: 21 September 1998
Abstract
We investigate the use of the hard thermal loop (HTL) resummation technique in
non-equilibrium field theory. We use the Keldysh representation of the real
time formalism (RTF). We derive the HTL photon self
energy and the resummed photon propagator. We show that no pinch singularities
appear in the non-equilibrium HTL effective propagator. We discuss a possible
regularization mechanism
for these singularities at higher orders.
As an example of the application
of the HTL resummation method within the RTF we discuss the damping rate
of a hard electron.
Copyright Springer-Verlag
